[PATCH] PPC64 dl-machine.h fixes for TLS M2

[Roland McGrath]

I put this in with some trivial cosmetic changes, plus I made
elf_machine_type_class match all the TPREL* relocs not just TPREL64.
I also fixed the REL64 computation, which was clearly bogus (typo I guess).

I haven't tested what I checked in, so I might have made a typo but
otherwise it should work assuming your version did.

Please verify that you don't get any "defined but not used" warnings about
elf_machine_tprel and also that it isn't compiled in as dead code in the
modules that include dl-machine.h but don't need it (i.e. rtld.os).



Thanks,
Roland